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Does CO4 flood?

Yes — parts of the CO4 district carry real flood risk: 11 of its 27 at-risk postcodes reach the Environment Agency's High likelihood band. The CO4 postcode district covers Wivenhoe, St Anne's and St John's, Greenstead, Mile End, close to Beacon End, Thorington Street, Polstead, and surrounding villages in parts of Suffolk and Essex.

27 postcodes in the CO4 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 11 high, 1 medium, 6 low, 9 very low. A postcode not listed here has no properties in any recorded risk band (which is good news, but never proof it cannot flood).

Free preview first · full report £19

Which CO4 postcodes are at risk?

CO4 3AL up to High CO4 3DL up to High CO4 3DP up to High CO4 3GD up to High CO4 3ZA up to High CO4 3ZE up to High CO4 3ZF up to High CO4 3ZG up to High CO4 3ZJ up to High CO4 5PS up to High CO4 5TB up to High CO4 5TA up to Medium CO4 0AU up to Low CO4 3AZ up to Low CO4 3BB up to Low CO4 3BD up to Low CO4 5SN up to Low CO4 5SS up to Low CO4 3AA up to Very low CO4 3AB up to Very low CO4 3AD up to Very low CO4 3BL up to Very low CO4 3GG up to Very low CO4 3UN up to Very low CO4 3ZH up to Very low CO4 3ZR up to Very low CO4 3ZT up to Very low

Rivers and flooding history near CO4

The rivers that matter here, each monitored live on FloodRadar:

74 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (14 at warning level or above), most recently 17 February 2026. Warnings cover flood areas, not individual addresses.

Recorded flood extents near the district (Environment Agency record):

Records, not floods: no outline on the record is not evidence a place has not flooded.

🏠 Buying or renting in CO4? The full property flood-risk report covers any postcode here — the official likelihood band, every recorded flood nearby with distances, warning history year by year, how the local rivers behave, and an insurance outlook, print-ready for £19. See what's in the report →

Flood risk in nearby postcode districts

CO3 CO5 CO2 CO6 CO1 CO7 CO8 CO9

Band = the worst likelihood band of any property in that postcode (EA Risk of Flooding from Rivers & Sea, defence-adjusted, area-level). Check any postcode in detail — or get the full £19 property report — at the property flood-risk report. © Environment Agency copyright and/or database right 2025. All rights reserved. Some features of this map are based on digital spatial data from the Centre for Ecology & Hydrology, © NERC (CEH). © Crown Copyright and Database Rights 2025 OS AC0000807064. This product is produced in part from PAF® and Multiple Residence Data, the copyright in which is owned by Royal Mail Group Limited and/or Royal Mail Group plc. All rights reserved. Licence number AC0000807064.